Unless you're the ultimate tourist, neck wearing shouldn't happen. In other words, if action isn't happening constantly around you, you don't have to be quite that ready. Plus it will wreck the neck lol. Sling it like a messenger bag toward your dominant hand so that you'll be ready for action.
The nex is cool, but more of a point and shoot in my opinion. I know it has options, but nothing can beat the feel of a good slr.I find it makes me more creative than a point and shoot with the same options because I FEEL like a photographer.